U
    e                     @   s   d dl Z d dlmZ d dlmZ d dlmZ d dlmZ d dl	m
Z
 d dlmZ d dlmZ d d	lmZ G d
d deZG dd deZdS )    N)urlparse)settings)PermissionDenied)mail_managers)HttpResponsePermanentRedirect)is_valid_path)MiddlewareMixin)escape_leading_slashesc                   @   s4   e Zd ZdZeZdd Zdd Zdd Zdd	 Z	d
S )CommonMiddlewarea  
    "Common" middleware for taking care of some basic operations:

        - Forbid access to User-Agents in settings.DISALLOWED_USER_AGENTS

        - URL rewriting: Based on the APPEND_SLASH and PREPEND_WWW settings,
          append missing slashes and/or prepends missing "www."s.

            - If APPEND_SLASH is set and the initial URL doesn't end with a
              slash, and it is not found in urlpatterns, form a new URL by
              appending a slash at the end. If this new URL is found in
              urlpatterns, return an HTTP redirect to this new URL; otherwise
              process the initial URL as usual.

          This behavior can be customized by subclassing CommonMiddleware and
          overriding the response_redirect_class attribute.
    c                 C   s   |j d}|dk	r2tjD ]}||rtdq| }tjr|r|ds| 	|rd| 
|}n| }| |j d| | S dS )z
        Check for denied User-Agents and rewrite the URL based on
        settings.APPEND_SLASH and settings.PREPEND_WWW
        HTTP_USER_AGENTNzForbidden user agentzwww.z://www.)METAgetr   ZDISALLOWED_USER_AGENTSsearchr   get_hostZPREPEND_WWW
startswithshould_redirect_with_slashget_full_path_with_slashget_full_pathresponse_redirect_classscheme)selfrequest
user_agentZuser_agent_regexhostpath r   </tmp/pip-unpacked-wheel-lctamlir/django/middleware/common.pyprocess_request"   s    



z CommonMiddleware.process_requestc                 C   sT   t jrP|jdsPt|dd}t|j|sPtd|j |}|rP|j}t|ddS dS )z
        Return True if settings.APPEND_SLASH is True and appending a slash to
        the request path turns an invalid path into a valid one.
        /urlconfNz%s/Zshould_append_slashTF)r   APPEND_SLASHZ	path_infoendswithgetattrr   func)r   r   r   matchviewr   r   r   r   >   s    z+CommonMiddleware.should_redirect_with_slashc                 C   sD   |j dd}t|}tjr@|jdkr@td|j| | d |S )z
        Return the full path of the request with a trailing slash appended.

        Raise a RuntimeError if settings.DEBUG is True and request.method is
        POST, PUT, or PATCH.
        T)Zforce_append_slash)POSTPUTPATCHa"  You called this URL via %(method)s, but the URL doesn't end in a slash and you have APPEND_SLASH set. Django can't redirect to the slash URL while maintaining %(method)s data. Change your form to point to %(url)s (note the trailing slash), or set APPEND_SLASH=False in your Django settings.)methodurl)r   r	   r   DEBUGr)   RuntimeErrorr   )r   r   new_pathr   r   r   r   L   s    
z)CommonMiddleware.get_full_path_with_slashc                 C   sL   |j dkr$| |r$| | |S |jsH|dsHtt|j|j	d< |S )z
        When the status code of the response is 404, it may redirect to a path
        with an appended slash if should_redirect_with_slash() returns True.
          zContent-Length)
status_coder   r   r   Z	streaming
has_headerstrlencontentheaders)r   r   responser   r   r   process_responsed   s
    z!CommonMiddleware.process_responseN)
__name__
__module____qualname____doc__r   r   r   r   r   r6   r   r   r   r   r
      s   r
   c                   @   s$   e Zd Zdd Zdd Zdd ZdS )BrokenLinkEmailsMiddlewarec                 C   s   |j dkrtjs| }| }|jdd}| ||||s|jdd}|jdd}td| 	||rndnd|f d	||||f d
d |S )z=Send broken link emails for relevant 404 NOT FOUND responses.r.   ZHTTP_REFERER r   z<none>ZREMOTE_ADDRzBroken %slink on %sz	INTERNAL z=Referrer: %s
Requested URL: %s
User agent: %s
IP address: %s
T)Zfail_silently)
r/   r   r+   r   r   r   r   is_ignorable_requestr   is_internal_request)r   r   r5   domainr   refererZuaipr   r   r   r6   w   s*    
	
z+BrokenLinkEmailsMiddleware.process_responsec                 C   s   t tdt| |S )ze
        Return True if the referring URL is the same domain as the current
        request.
        z^https?://%s/)boolrer$   escape)r   r?   r@   r   r   r   r>      s    z.BrokenLinkEmailsMiddleware.is_internal_requestc                    s   |sdS t jr, dr,| dd kr,dS | ||sDd|krDdS t|}|jd|fkrh|j krhdS t fddt jD S )	z
        Return True if the given request *shouldn't* notify the site managers
        according to project settings or in situations outlined by the inline
        comments.
        Tr   N?r<   c                 3   s   | ]}|  V  qd S )N)r   ).0patternurir   r   	<genexpr>   s     zBBrokenLinkEmailsMiddleware.is_ignorable_request.<locals>.<genexpr>)	r   r    r!   r>   r   netlocr   anyZIGNORABLE_404_URLS)r   r   rJ   r?   r@   Zparsed_refererr   rI   r   r=      s     z/BrokenLinkEmailsMiddleware.is_ignorable_requestN)r7   r8   r9   r6   r>   r=   r   r   r   r   r;   v   s   r;   )rC   urllib.parser   Zdjango.confr   Zdjango.core.exceptionsr   Zdjango.core.mailr   Zdjango.httpr   Zdjango.urlsr   Zdjango.utils.deprecationr   Zdjango.utils.httpr	   r
   r;   r   r   r   r   <module>   s   i